Seasteading. Ok, we’re not actually obsessed with Seasteading. What we are obsessed with are the increasingly convoluted proposals to create floating nations at sea (heck, I even wrote a novel or two about that). Fresh from the New Republic: Libertarians Seek a Home on the High Seas.

This Friday, tune in to National Geographic Wild for a day of sharks! Starting at noon, they will air a series of shark documentaries culminating at 9 p.m. with “Shark Attack Experiment: Live“. This show, aired live from the shark hotspot of South Africa, aims to test some common myths about shark attacks and to “to dispel negative myths about sharks and raise public awareness that some shark species are being driven to extinction by overfishing”. In addition to the live experiments, survivors of shark attacks will get the opportunity, while surrounded by trained shark-diving professionals, to face their fears and intentionally interact with sharks. The whole thing will also be live-blogged, and organizers have included a social media component (Twitter #sharkattack). Check it out!

We are in the midst of a global extinction crisis. Biodiversity is in decline as species after species disappear. Some estimates predict that up to 50% of species will be committed to extinction by 2050. Other estimates claim the current rate of extinction may be 10,000 times the background rate. Many ecologists and conservationists have declared the current species decline the sixth great mass extinction.

A recent paper published in the journal Nature argues that our current estimates of species loss are based on a flawed model and tend to overestimate the magnitude of species decline. The paper has received plenty of attention, and has been heavily criticized by ecologists and conservation biologists. The paper is wrong, but it is wrong for the right reasons, and the criticisms it has garnered point to a gaping hole in our understanding of population dynamics.

Expedition Week 2011 starts tonight on the National Geographic Channel. This year, there are 13 premieres on seven straight nights, and they promise “extreme treks, new discoveries, and bold investigations” featuring topics as diverse as conservation, exotic human cultures, archaeology, geology, and maritime history. In other words, there’s plenty for science geeks like us to enjoy.

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